How to COPY files from outside of the Earthfile's directory? - earthly

Question

Suppose I have a monorepo. Apps (app1, app2) use a Gradle as a build system and share some build-logic with includeBuild("../shared-build-logic") which is outside of the root of each app.
├── shared-build-logic
│   └── src/...
└── app1
├── Earthfile
├── build.gradle
├── src/...
└── app2
├── Earthfile
├── build.gradle
├── src/...
Is it possible for Earthfile to access the files from outside of its root folder or Earthly has the same restrictions as Dockerfile?
I get the following error on attempt to COPY ../shared-build-logic ./:
============================ ❌ FAILURE [2. Build 🔧] ============================
Repeating the output of the command that caused the failure
+compile *failed* | --> COPY ../shared-build-logic ./
+compile *failed* | [no output]
+compile *failed* | ERROR Earthfile line 22:4
+compile *failed* | The command
+compile *failed* | COPY ../shared-build-logic ./
+compile *failed* | failed: "/shared-build-logic": not found
I would also like to perform integration testing with the docker-compose.yaml file located one level above the Eartfile root, but facing the similar problem:
integration-tests:
FROM earthly/dind:alpine
COPY ../docker-compose.yaml ./ # <------- does not work
WITH DOCKER --compose docker-compose.yaml --load build-setup=+compile --allow-privileged
RUN docker run -e SPRING_DATA_MONGODB_URI=mongodb://mongodb:27017/test-db --network=default_dev-local build-setup ./gradlew test
END
Is my the only solution to the problem to move Earthfile itself one level upper?

Answer 1

While you can't directly access targets outside of your Earthfile directory you can reference targets.
This allows you to write a target in an Earthfile under shared-build-logic that saves an artifact containing those files
You can expose the files you need by using a target.
shared-build-logic/Earthfile
files:
WORKDIR files
# Copy all of files you want to share
SAVE ARTIFACT ./*
app/Earthfile
use-files:
COPY ../shared-build-logic+files/* .
# do stuff
You should be able to do something similar with you integration-test target.
Earthfile
files:
WORKDIR files
SAVE ARTIFACT docker-compose.yaml
folder-with-integration-tests/Earthfile
integration-tests:
FROM earthly/dind:alpine
COPY ../+files/docker-compose.yaml ./
WITH DOCKER --compose docker-compose.yaml --load build-setup=+compile --allow-privileged
RUN docker run -e SPRING_DATA_MONGODB_URI=mongodb://mongodb:27017/test-db --network=default_dev-local build-setup ./gradlew test
END